[bug #15584] 3.81 does way too much work in some pathalogical situations.

[Sol Swords]

Follow-up Comment #14, bug #15584 (project make):

I ran into this problem with some real work.  I realize it's probably not
common to have such a large tree of secondary/intermediate files, but due to
the nature of our build process it would be nice if that worked without
hitting this performance limitation.

In case it clarifies anything, I've attached a makefile (named BadMakefile)
that replicates the problem.  You can see the pattern; adding another level of
hierarchy approximately doubles the time it takes to "make all".  Also I
predict that if you run this with "make -d" it will produce ~10GB of output.


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